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The effect of alpha-case formation on plastic deformation and fracture of near β titanium alloy

机译：α-壳形成对近β钛合金塑性变形和断裂的影响

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The paper studies the effect of oxidation on the plastic deformation and fracture of near beta titanium alloy Ti-5Al-5V-5Mo-1Cr-1Fe produced by radial shear rolling. It is shown that the aging of the rolled titanium alloy in ambient air at 550 degrees C for 3 h leads to the formation of an oxide (alpha-case) layer 1.5-2 mu m thick with a simultaneous decrease in the strength and ductility of oxidized specimens under tension at room temperature. The study of the gauge section surface and fracture behavior revealed that the reason for ductility reduction in alloy specimens with an oxide layer in tension is the development of surface microcracks, whose density and depth increase with strain. The growth of microcracks to a depth exceeding the alpha-case layer thickness causes brittle fracture. The strength decrease of alloy specimens with an alpha-case layer is caused by a decrease in the microhardness of the near-surface layer due to reduced V and Mo concentrations, which influences the solid solution hardening of titanium alloys, as well as by a change in the beta-phase decomposition kinetics due to oxygen diffusion.
机译：本文研究了氧化对径向剪切轧制产生的近β钛合金Ti-5Al-5V-5Mo-1Cr-1Fe塑性变形和断裂的影响。结果表明，轧制钛合金在550摄氏度的环境空气中老化3小时会导致形成1.5-2μm厚的氧化物（α-壳）层，同时强度和延展性降低。室温下在高温下氧化的试样。对规范截面的表面和断裂行为的研究表明，在拉伸状态下具有氧化层的合金试样的延展性降低的原因是表面微裂纹的发展，其密度和深度随应变而增加。微裂纹的增长到超过α-壳层厚度的深度会导致脆性断裂。带有α-表面层的合金试样的强度降低是由于V和Mo浓度降低导致近表层的显微硬度降低，这影响了钛合金的固溶硬化以及变化。在β相中由于氧扩散而分解的动力学。

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